Connecting pin shaft anti-shaft-shifting device of electric hydraulic excavator
By installing a detection system and an alarm system on the electro-hydraulic excavator, and using laser displacement sensors and protection devices, the problems of inaccurate detection of pin shaft displacement at the connection of the electro-hydraulic excavator are solved, and the stable operation and cost of the equipment are achieved reduce.
Patent Information
- Application Number
- CN202420346719.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-26
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-02-26
AI Technical Summary
The joint of the electro-hydraulic excavator lacks a series-axis alarm device, resulting in inaccurate manual inspection, and the pin shaft at the connection between the rotary platform and the support cylinder only uses fixed pins and no other protection devices, resulting in low reliability and increasing maintenance costs. .
A connecting pin shaft anti-serial shaft device including a detection system, an alarm system and a protection device is designed. The laser displacement sensor is used to detect the pin shaft displacement, and the maintenance personnel are reminded through the alarm system that the protection device restricts the position movement of the pin shaft through the support shaft. Avoid structural damage.
Accurate detection and advance prevention of the pin shaft of the electro-hydraulic excavator is achieved, which reduces maintenance costs, ensures long-term and stable operation of the equipment, avoids structural damage, and reduces maintenance costs.
Smart Images
Figure CN222140155U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of protection of electric hydraulic excavators, in particular to a connecting pin shaft anti-sequence device of an electric hydraulic excavator. Background Art
[0002] During the process of loading cargo with electric hydraulic excavators, the bucket arm, hydraulic cylinder, bucket, support cylinder and slewing platform are often subjected to frequent impact and vibration, which can cause the pins at the connection of the equipment (such as the pins at the connection between the forearm and bucket, the pins at the connection between the forearm and the arm, the pins at the connection between the support cylinder and the slewing platform, etc.) to move outward axially or even fall off. Once the pins are axially displaced, it will not only affect the normal production, but also cause serious damage to the mechanical structure of the equipment, thereby increasing the cost of equipment use, maintenance and repair.
[0003] However, there is no corresponding anti-separation alarm device for the connecting pins of the bucket arm, hydraulic cylinder, bucket, supporting cylinder and slewing platform on the electric hydraulic excavator. During routine maintenance, maintenance personnel generally use the naked eye to check whether the pins at the connection have axial outward displacement. However, due to the influence of many factors such as blind spots in the observation field of view, different working conditions, and differences in work experience during the operation of the equipment, the results of manual inspection are extremely unstable. Therefore, the existing technology lacks long-term and systematic monitoring of the equipment operation process.
[0004] In addition, the pin shaft at the connection between the slewing platform and the supporting oil cylinder on the electric hydraulic excavator bears the overall weight of the excavation mechanism composed of the bucket, bucket arm, oil cylinder and other structures, and bears a relatively large load. The pin shaft here is generally only fixed with a fixed pin, without other protective devices, and has low reliability. Once the pin shaft at the connection between the slewing platform and the supporting oil cylinder of the electric hydraulic excavator moves axially outward, the connection is extremely likely to bear excessive deflection torque, causing structural damage, and ultimately the slewing platform and supporting oil cylinder can only be replaced, resulting in increased equipment repair and maintenance costs, as well as unnecessary waste of manpower and material resources. Utility Model Content
[0005] The main purpose of the utility model is to provide an anti-axis stringing device for the connecting pin shaft of an electric hydraulic excavator, so as to solve the problems in the prior art that the connecting pin shafts at the bucket arm, hydraulic cylinder, etc. of the electric hydraulic excavator have no corresponding anti-axis stringing alarm device, and only rely on the naked eye judgment of the staff, resulting in inaccurate judgment, and the pin shaft at the connection between the rotating platform and the supporting cylinder on the electric hydraulic excavator is only fixed by a fixing pin, without other protective devices, and has low reliability.
[0006] In order to solve the above technical problems, the utility model is implemented as follows: a connecting pin shaft anti-separation device for an electric hydraulic excavator, comprising: a detection system, an alarm system and a protection device;
[0007] The detection system is provided with a plurality of them, and they are respectively installed at the connection between the bucket and the connecting rod, the connection between the forearm and the bucket, the connection between the two connecting rods and the forearm cylinder, the connection between the connecting rod and the forearm, the connection between the forearm and the boom, the connection between the forearm cylinder and the forearm, the connection between the forearm and the boom cylinder, the connection between the boom and the supporting cylinder, the connection between the boom cylinder and the boom, the connection between the slewing platform and the boom, and the two connections between the slewing platform and the supporting cylinder; each of the detection systems includes a laser displacement sensor, which is located on the outside of one end of the pin shaft provided at each connection, and the measuring line of the laser displacement sensor is collinear with the central axis of the corresponding pin shaft;
[0008] The alarm system includes a monitoring and display platform, each of the laser displacement sensors is electrically connected to the monitoring and display platform, and a sound alarm and a plurality of indicator lights are provided on the monitoring and display platform, each indicator light corresponds to a connection point;
[0009] The protective device is arranged in the middle position of the two connections between the rotating platform and the supporting cylinder; the anti-axis stringing device includes a supporting shaft, which is arranged between two pin shafts corresponding to the two connections between the rotating platform and the supporting cylinder, and the axial direction of the supporting shaft is parallel to the axial direction of the pin shaft, and the two ends of the supporting shaft are respectively tightened against the two pin shafts; wherein the detection device arranged at the two connections between the rotating platform and the supporting cylinder is arranged at the end of the corresponding pin shaft away from the protective device.
[0010] As a further technical solution, each of the detection systems also includes a mounting bracket for installing a laser displacement sensor. The mounting bracket is fixedly welded at the corresponding connection and is located on the outside of one end of the pin shaft set at the corresponding connection. The laser displacement sensor is fixedly mounted on the mounting bracket.
[0011] As a further technical solution, the anti-axis stringing device also includes an upper cover of the support shaft and a lower cover of the support shaft, the upper cover of the support shaft and the lower cover of the support shaft are both semicircular and can be connected to each other to form a circle, the lower cover of the support shaft and the upper cover of the support shaft are respectively sleeved on the upper and lower sides of the support shaft and clamp the support shaft, and the upper cover of the support shaft and the lower cover of the support shaft are fixed by bolts; wherein the lower cover of the support shaft is fixedly set on the rotating platform.
[0012] As a further technical solution, a support rod and a fixed base are provided at the bottom of the support shaft lower cover, the fixed base is fixed to the rotating platform by bolts, and the support rod is vertically and fixedly arranged above the fixed base; the bottom of the support shaft lower cover is fixedly connected to the top of the support rod.
[0013] As a further technical solution, connecting heads are fixed at both ends of the support shaft upper cover and the support shaft lower cover. After the support shaft upper cover and the support shaft lower cover are butt-jointed, the connecting head of the support shaft upper cover and the connecting head of the support shaft lower cover are connected by bolts.
[0014] As a further technical solution, the support shaft upper cover, the support shaft lower cover and the support rod are each provided with at least one.
[0015] The beneficial effects of the utility model are:
[0016] 1. This application solves the problem that the pins at the connection of the electric hydraulic excavator's slewing platform, large and small arms, cylinders, buckets, etc. are easily damaged, and the problem that the shafts are difficult to detect in hidden places without affecting the operation of the original equipment's shoveling device. It not only reduces the maintenance cost of the pins of the electric hydraulic excavator, but also realizes the early prevention of major equipment accidents. At the same time, the information of the laser displacement sensor at one end of the pin can also be uploaded to the intelligent equipment management platform of the mining equipment, realizing online statistics of equipment information, completing the intelligent management section of the mining equipment, and thus reducing production costs and achieving cost reduction and efficiency improvement.
[0017] 2. This application uses a protective device to limit the axial position movement of the pins at the slewing platform and the supporting oil cylinder. The setting of the protective device can ensure the long-term stable operation of the excavation equipment, ensure the normal order of production, and try to avoid the axial displacement of the pins at the connection between the slewing platform and the supporting oil cylinder of the electric hydraulic excavator, and try to avoid the damage to the slewing platform and the supporting oil cylinder structure caused by the additional torque generated by the axial outward movement of the pins, thereby reducing the overall repair and maintenance costs of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0019] Figure 1 It is a position diagram of each connection point in the utility model;
[0020] Figure 2 This is a schematic diagram of the monitoring and display platform in the utility model;
[0021] Figure 3 This is a three-dimensional diagram of the connection between the rotary platform and the supporting oil cylinder in the utility model;
[0022] Figure 4It is a front view of the protection device in the utility model;
[0023] Figure 5 It is a side view of the protective device in the utility model.
[0024] Description of Reference Numerals
[0025] 1. The connection between bucket and connecting rod; 2. The connection between forearm and bucket; 3. The connection between two connecting rods and forearm cylinder; 4. The connection between connecting rod and forearm; 5. The connection between forearm and boom; 6. The connection between forearm cylinder and forearm; 7. The connection between forearm and boom cylinder; 8. The connection between boom and supporting cylinder; 9. The connection between boom cylinder and boom; 10. The connection between slewing platform and boom; 11. The two connections between slewing platform and supporting cylinder; 12. Monitoring display platform; 13. Sound alarm; 14. Indicator light 1; 15. Indicator light 2; 16. Indicator light 3; 17. Indicator light four; 18. Indicator light five; 19. Indicator light six; 20. Indicator light seven; 21. Indicator light eight; 22. Indicator light nine; 23. Indicator light ten; 24. Indicator light eleven; 25. Indicator light twelve; 26. Laser displacement sensor; 27. Mounting bracket; 28. Support shaft; 29. Support shaft upper cover; 30. Support shaft lower cover; 31. Fixed base; 32. Support rod; 33. Connecting head; 34. Support cylinder; 35. Rotating platform; 36. Connecting column; 37. Fixed head; 38. Pin; 39. Fixed pin; 40. End cover. DETAILED DESCRIPTION
[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.
[0027] like Figure 1-Figure 5 As shown, the utility model proposes a connecting pin shaft anti-separation device for an electric hydraulic excavator, including: a detection system, an alarm system and a protection device. Figure 1 As shown, the bucket arm, hydraulic cylinder, bucket and other joints of the mining electric hydraulic excavator are connected by a pin shaft 38, wherein one end of the pin shaft 38 is provided with an end cover 40, and the other end of the pin shaft 38 is provided with a fixing pin 39 for positioning the pin shaft 38 (such as Figure 3 As shown), the aperture of the end cap 40 is larger than the aperture of the connection (e.g. Figure 3Therefore, the pin 38 will not be axially displaced toward the side of the fixing pin 39, but will be axially displaced toward the side of the end cover 40. Figure 1 As shown, the above-mentioned multiple connections are respectively a connection 1 between the bucket and the connecting rod, a connection 2 between the forearm and the bucket, a connection 3 between two connecting rods and the forearm cylinder, a connection 4 between the connecting rod and the forearm, a connection 5 between the forearm and the boom, a connection 6 between the forearm and the boom cylinder, a connection 7 between the forearm and the boom cylinder, a connection 8 between the boom and the supporting cylinder, a connection 9 between the boom cylinder and the boom, a connection 10 between the slewing platform and the boom, and two connections 11 between the slewing platform and the supporting cylinder (such as Figure 3 As shown, two groups of fixed heads 37 for connecting with the supporting oil cylinder 34 are arranged on the rotating platform 35, and the supporting oil cylinder 34 is connected to the two groups of fixed heads 37 through the pins 38 respectively. These are two connecting points, and there is a distance between the pins 38 of the two connecting points. The connection method of the pins 38 used in each connecting point is as shown in FIG. Figure 3 The arrangement of the middle pin 38 is the same, that is, the pin 38 is inserted into the corresponding two parts, and a fixing pin 39 is arranged at one end for fixing. Therefore, under frequent or strong impacts and vibrations, the pin 38 will be skewing, that is, axial displacement to the side away from the fixing pin 39. It is worth noting that all the above-mentioned joints and the pins 38 at the joints are prior art.
[0028] In order to avoid the axial displacement of the pin shaft which cannot be detected manually, the present application sets up a detection system, wherein there are multiple detection systems, which are respectively installed at the connection 1 between the bucket and the connecting rod, the connection 2 between the forearm and the bucket, the connection 3 between the two connecting rods and the forearm cylinder, the connection 4 between the connecting rod and the forearm, the connection 5 between the forearm and the boom, the connection 6 between the forearm cylinder and the forearm, the connection 7 between the forearm and the boom cylinder, the connection 8 between the boom and the supporting cylinder, the connection 9 between the boom cylinder and the boom, the connection 10 between the slewing platform and the boom, and the two connections 11 between the slewing platform and the supporting cylinder (wherein one detection system is respectively set at the two connections between the slewing platform and the supporting cylinder). Each detection system includes a laser displacement sensor 26, which is located on the outside of one end of the pin shaft 38 set at each connection, and the measuring line of the laser displacement sensor 26 is collinear with the central axis of the corresponding pin shaft 38. In addition, each detection system also includes a mounting bracket 27 for mounting the laser displacement sensor 26. The mounting bracket 27 is fixedly welded to the corresponding connection and is located outside one end of the pin 38 provided at the corresponding connection. The laser displacement sensor 26 is fixedly mounted on the mounting bracket 27. Figure 3As shown, there are two connection points 11 between the slewing platform and the supporting oil cylinder. In this embodiment, the mounting bracket 27 is rectangular, wherein a plurality of connecting columns 36 are fixedly provided on one side of the mounting bracket 27, and the other ends of the plurality of connecting columns 36 are welded to a fixed head 37 provided on the slewing platform 35 for connecting with the supporting oil cylinder 34. Due to the provision of the connecting columns 36, there is a certain distance between the mounting bracket 27 and the side wall of the fixed head 37, and there is also a certain distance between the mounting bracket 27 and the end of the pin 38. The laser displacement sensor 26 is fixed on the mounting bracket 27, and its measuring line is colinear with the central axis of the pin 38. Specifically, the laser displacement sensor 26 measures the distance between the end face of the pin 38 and the laser displacement sensor 26 to determine whether the pin 38 has axial displacement.
[0029] The pin 38 has two ends, one end is an end where the fixing pin 39 is set, and the other end is an end where the end cap 40 is set. If the laser displacement sensor 26 is set at the end of the fixing pin 39 of the pin 38, when the pin 38 is axially displaced, the distance between the end of the pin 38 detected by the laser displacement sensor 26 and the laser displacement sensor 26 will increase. If the laser displacement sensor 26 is set at the end of the end cap 40 of the pin 38, when the pin 38 is axially displaced, the distance between the end of the pin 38 detected by the laser displacement sensor 26 and the laser displacement sensor 26 will decrease.
[0030] In addition, the present application also has an alarm system, which includes a monitoring and display platform 12, each of the laser displacement sensors 26 is electrically connected to the monitoring and display platform 12, and a sound alarm 13 and a plurality of indicator lights are provided on the monitoring and display platform 12, and each indicator light corresponds to one of the above-mentioned connections. The laser displacement sensor 26 transmits the detected data to the monitoring and display platform 12, and the monitoring and display platform 12 uniformly monitors the data, wherein a range of data fluctuations is preset in the monitoring and display platform 12, and once the monitoring and display platform 12 detects that the data exceeds these preset ranges, the sound alarm 13 on the monitoring and display platform 12 is controlled to sound an alarm. And each indicator light on the monitoring and display platform 12 corresponds to one of the above-mentioned connections. Figure 2As shown, when the position of the pin shaft at the connection 1 between the bucket and the connecting rod moves outward, the indicator light 14 flashes and the sound alarm 13 sounds an alarm; when the position of the pin shaft at the connection 2 between the forearm and the bucket moves outward, the indicator light 2 15 flashes and the sound alarm 13 sounds an alarm; when the position of the pin shaft at the connection 3 between the two connecting rods and the forearm cylinder moves outward, the indicator light 3 16 flashes and the sound alarm 13 sounds an alarm; when the position of the pin shaft at the connection 4 between the connecting rod and the forearm moves outward, the indicator light 4 17 flashes and the sound alarm 13 sounds an alarm; when the position of the pin shaft at the connection 5 between the forearm and the boom moves outward, the indicator light 5 18 flashes and the sound alarm 13 sounds an alarm; when the position of the pin shaft at the connection 6 between the forearm cylinder and the forearm moves outward, the indicator light 6 19 flashes and the sound alarm 13 sounds an alarm; When the axis position moves outward, indicator light seven 20 flashes and the sound alarm 13 sounds an alarm; when the pin position of the connection between the boom and the supporting cylinder 8 moves outward, indicator light eight 21 flashes and the sound alarm 13 sounds an alarm; when the pin position of the connection between the boom cylinder and the boom 9 moves outward, indicator light nine 22 flashes and the sound alarm 13 sounds an alarm; when the pin position of the connection between the slewing platform and the boom moves outward, indicator light ten 23 flashes and the sound alarm 13 sounds an alarm; when the pin position of the left connection of the two connections 11 between the slewing platform and the supporting cylinder moves outward, indicator light eleven 24 flashes and the sound alarm 13 sounds an alarm; when the pin position of the right connection of the two connections 11 between the slewing platform and the supporting cylinder moves outward, indicator light twelve 25 flashes and the sound alarm 13 sounds an alarm.
[0031] The alarm system and detection system in this application are powered by a 24V power supply, and no additional power supply and transformer equipment are required. In addition, the laser displacement sensor 26 uses CHANKO-CPA, which is a photoelectric sensor with a monitoring range of 0-100mm and a required power supply voltage of 24V. The overall structure is impact-resistant and vibration-resistant, and can work normally at -25 to 55°C. In actual operation, the laser displacement sensor 26 is generally set at one end of the pin shaft 38 where the fixing pin 39 is set. When the laser displacement sensor 26 detects that the displacement between the end face of one end of the pin 38 where the fixing pin 39 is set and the laser displacement sensor 26 is reduced by more than 5mm, the monitoring and display platform 12 will make a corresponding judgment and display the string shaft position information on the monitoring and display platform 12. The string shaft position indicator light will light up to display the specific position of the connection where the pin 38 is displaced, and the sound alarm 13 will sound an alarm to notify the staff to carry out maintenance work. The model of the display used by the monitoring and display platform 12 is WAEMIN, the indicator light uses a 16mm red indicator light, and the model of the sound alarm is YD-B2207, which can work normally under an environment of -20 to 60°C, and the overall size is 22mm 7mm, sound pressure level ≥85DB, the alarm effect is more significant.
[0032] The alarm system in this application can also be connected to the information of the intelligent equipment management platform of the mining equipment, upload the information of the laser displacement sensor to the intelligent equipment management platform of the mining equipment, realize online statistics of equipment information, complete the intelligent management section of the mining equipment, and thus reduce production costs and achieve cost reduction and efficiency improvement.
[0033] In addition, the present application also provides a protective device at the two joints 11 between the rotary platform and the supporting oil cylinder, wherein Figure 3 As shown, the two connections 11 between the slewing platform and the supporting cylinder, wherein the supporting cylinder 34 is respectively connected to the two groups of fixed heads 37 on the slewing platform 35 through the pins 38, and the two pins 38 are symmetrically arranged. The protection device in the present application is arranged in the middle position of the two connections 11 between the slewing platform and the supporting cylinder, that is, arranged between the two pins 38. The protection device includes a support shaft 28, and the support shaft 28 is arranged between the two pins 38 corresponding to the two connections 11 between the slewing platform and the supporting cylinder, and the axial direction of the support shaft 28 is parallel to the axial direction of the pins 38; the two ends of the support shaft 28 are respectively tightened against the two pins 38. In this embodiment, the detection device arranged at the two connections 11 between the slewing platform and the supporting cylinder is arranged at the end of the corresponding pin 38 away from the protection device, that is, arranged at the end of the pin 38 where the fixing pin 39 is arranged. In addition, the protective device also includes a support shaft upper cover 29 and a support shaft lower cover 30. The support shaft upper cover 29 and the support shaft lower cover 30 are both semicircular and can be connected to each other to form a circle. The support shaft lower cover 29 and the support shaft upper cover 30 are respectively sleeved on the upper and lower sides of the support shaft 28 and clamp the support shaft 28. The support shaft upper cover 29 and the support shaft lower cover 30 are fixed by bolts; the support shaft lower cover 30 is fixedly set on the rotating platform 35. The bottom of the support shaft lower cover 30 is provided with a fixed base 31 and a support rod 32. The fixed base 31 is fixed on the rotating platform 35 by bolts. The support rod 32 is vertically and fixedly set above the fixed base 31; the support shaft lower cover 30 is fixedly connected to the top of the support rod 32. Both ends of the support shaft upper cover 29 and the support shaft lower cover 30 are fixedly provided with a connector 33. After the support shaft upper cover 29 and the support shaft lower cover 30 are connected, the connector 33 of the support shaft upper cover 29 is connected with the connector 33 of the support shaft lower cover 30 by bolts.
[0034] In addition, in this embodiment, the support shaft upper cover 29, the support shaft lower cover 30 and the support rod 32 are provided with two sets, and the two sets of components are symmetrically arranged on the support shaft 28, such as Figure 3 shown.
[0035] Since the pin shaft 38 is not provided with one end of the fixed pin 39, that is, the diameter of the end cover 40 of the pin shaft 38 is larger than the aperture on the fixed head 37 of the rotating platform 35, the end cover 40 prevents the pin shaft 38 from axially shifting toward the fixed pin 39; therefore, as long as the pin shaft 38 does not shift axially away from the fixed pin 39, the pin shaft 38 can be ensured to play a good fixing role. In the present application, the support shaft 28 is arranged between the two pin shafts 38, and the two ends respectively support the two pin shafts 38 to prevent the two pin shafts 38 from shifting toward the middle position, that is, away from the fixed pin 39. Among them, the support shaft 28 mainly bears the axial position deviation of the pin shaft 38 at the connection between the rotating platform and the supporting oil cylinder of the electric hydraulic excavator. The upper cover 29 of the support shaft prevents the upward radial displacement of the support shaft 28, and the support rod 32 of the fixed base 31 and the lower cover 30 of the support shaft can limit the downward radial displacement of the support shaft 28, thereby avoiding the axial displacement of the pin shaft 38 at the two connections 11 of the rotating platform and the supporting oil cylinder to the greatest extent.
[0036] The support shaft 28 of the protective device in this application adopts a carburizing process to ensure its external hardness while making its internal toughness meet the working requirements, and has strong strength and the ability to resist vibration and impact. The fixed base 31 is responsible for carrying the support shaft 28, and the whole is connected by a welding process. The fixed base 31 is connected to the rotating platform 35 by bolts to play a fixing role. The upper cover 29 of the support shaft prevents the support shaft 28 from detaching from the fixed base 31. The upper cover 29 of the support shaft is connected to the lower cover 30 of the support shaft by bolts to fix the support shaft 28, thereby further fixing the pin shaft 38 of the two joints 11 of the rotating platform and the supporting cylinder of the electric hydraulic excavator.
[0037] The protection device in this application solves the problem of lack of protection device for the pin shaft 38 of the two joints 11 between the slewing platform and the supporting oil cylinder of the electric hydraulic excavator, which is prone to axial position deviation without affecting the dynamic balance of the slewing system of the original equipment. During the production process, the pin shaft 38 of the two joints 11 between the slewing platform and the supporting oil cylinder will produce axial position deviation under the action of external factors, causing the position deviation of the excavation operation device, resulting in excessive load on the joint and causing structural damage. The device can avoid axial position deviation of the pin shaft 38 and damage to the joint to the greatest extent, thereby reducing maintenance and repair costs and ensuring the normal production order of the mine.
[0038] The above description is only a preferred embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
Claims
1. A connecting pin anti-separation device for an electric hydraulic excavator, characterized in that: include: Detection systems, alarm systems and protection devices; The detection system is provided with a plurality of them, and they are respectively installed at the connection between the bucket and the connecting rod, the connection between the forearm and the bucket, the connection between the two connecting rods and the forearm cylinder, the connection between the connecting rod and the forearm, the connection between the forearm and the boom, the connection between the forearm cylinder and the forearm, the connection between the forearm and the boom cylinder, the connection between the boom and the supporting cylinder, the connection between the boom cylinder and the boom, the connection between the slewing platform and the boom, and the two connections between the slewing platform and the supporting cylinder; each of the detection systems includes a laser displacement sensor, which is located on the outside of one end of the pin shaft provided at each connection, and the measuring line of the laser displacement sensor is collinear with the central axis of the corresponding pin shaft; The alarm system includes a monitoring and display platform, each of the laser displacement sensors is electrically connected to the monitoring and display platform, and a sound alarm and a plurality of indicator lights are provided on the monitoring and display platform, each indicator light corresponds to a connection point; The protection device is arranged in the middle position of the two connections between the rotating platform and the supporting oil cylinder; the protection device includes a support shaft, which is arranged between two pin shafts corresponding to the two connections between the rotating platform and the supporting oil cylinder, and the axial direction of the support shaft is parallel to the axial direction of the pin shaft, and the two ends of the support shaft are respectively tightened against the two pin shafts; wherein the detection device arranged at the two connections between the rotating platform and the supporting oil cylinder is arranged at the end of the corresponding pin shaft away from the protection device.
2. The connecting pin anti-separation device for an electric hydraulic excavator according to claim 1, characterized in that: Each of the detection systems also includes a mounting bracket for mounting a laser displacement sensor, the mounting bracket is fixedly welded to the corresponding connection and is located on the outside of one end of a pin shaft provided at the corresponding connection, and the laser displacement sensor is fixedly mounted on the mounting bracket.
3. The connecting pin anti-separation device for an electric hydraulic excavator according to claim 1, characterized in that: The anti-axis stringing device also includes an upper cover of the support shaft and a lower cover of the support shaft, both of which are semicircular and can be connected to each other to form a circle, and the lower cover of the support shaft and the upper cover of the support shaft are respectively sleeved on the upper and lower sides of the support shaft and clamp the support shaft, and the upper cover of the support shaft and the lower cover of the support shaft are fixed by bolts; wherein the lower cover of the support shaft is fixedly set on the rotating platform.
4. The connecting pin anti-separation device for an electric hydraulic excavator according to claim 3, characterized in that: A support rod and a fixed base are provided at the bottom of the support shaft lower cover. The fixed base is fixed to the rotating platform by bolts. The support rod is vertically and fixedly arranged above the fixed base. The bottom of the support shaft lower cover is fixedly connected to the top of the support rod.
5. The connecting pin anti-separation device for an electric hydraulic excavator according to claim 3, characterized in that: Both ends of the support shaft upper cover and the support shaft lower cover are fixed with connecting heads. After the support shaft upper cover and the support shaft lower cover are butted against each other, the connecting head of the support shaft upper cover is connected with the connecting head of the support shaft lower cover by bolts.
6. The connecting pin anti-separation device for an electric hydraulic excavator according to claim 5, characterized in that: The support shaft upper cover, the support shaft lower cover and the support rod are each provided with at least one.